Wavetek 132 Spezifikationen PDF herunterladen (Seite 81)

Lab

3:

Amplitude

and

Frequency

Modulation

Solutions

Id)

Q:

Compute

and

draw

the

spectra

of

the

square

wave

input

and

the

AM

wave.

A:

Square

wave:

m(t)

=

(sinco/

+

—

sin3to/

+

—

sin5<»>/

+

)

TC

3

5

2

1

1

w

(

0

=

—

(OTI2IC1000/

+

—

SüI2TC3000/

+

—

sin27t5000/

+

)

7i

3

5

m(f)

=

j—

[»(/"

+

1000)

+

b(f-

1000)]

+

y

—

[b(f

+

3000)

+

b(f

-

3000)]

7t

3

%

+

j-^—

[b(f+

5000)

+

b(f-

5000)]

5

7C

AM

wave:

x(t)

=

A

[1

+

k

m(t)]

sin

2TC//

2

1

x(t)

=

1

[1

+

k

a

—

(sin2

%1000t

+

—

sin27c3000/

a

7

i

3

+

—

sin

2

7c

5000/)]

««2

TC

20000/

5

Lab

3

Solutions

Page

1

71

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